Question

A pillar in the shape of a cylinder has diameter 42 cm and height 3m. Find the curved surface area of the pillar.

Answer 1

Answer:

396 cm^2 is the correct answer

Answer 2

The curved surface area of the pillar is 39600 cm².

• Given :

Diameter of the pillar = 42 cm

Radius of the pillar = 42/2 = 21 cm

Height of the pillar = 3 m = 300 cm.

Pillar is in the shape of a cylinder.

• Curved surface area of the cylinder is given by ,

Curved area = 2πrh

• Substituting the radius and height , we get

Curved area = 2π(21)(300)

Curved area = 2(22/7)(21)(300)

Curved area = 39600 cm².

• The curved surface area of the pillar is 39600 cm².